Dayton, Ohio is 27% larger than Grand Rapids, Michigan.
Area: 149 km2 calculated
Population: 141,359 (2012)
Dayton is the sixth largest city in the U.S. state of Ohio and is the county seat of Montgomery County. Wikipedia
Area: 117 km2 calculated
Population: 190,411 (2012)
Grand Rapids is a city in the U.S. state of Michigan. It is located on the Grand River about 25 miles east of Lake Michigan. As of the 2010 census, the city population was 188,040. Wikipedia